Add Changelog entry for interruptible key generation

Signed-off-by: Waleed Elmelegy <waleed.elmelegy@arm.com>
diff --git a/ChangeLog.d/add-psa-iop-generate-key.txt b/ChangeLog.d/add-psa-iop-generate-key.txt
new file mode 100644
index 0000000..0f586ee
--- /dev/null
+++ b/ChangeLog.d/add-psa-iop-generate-key.txt
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+Features
+   * Add an interruptible version of generate key to the PSA interface.
+     See psa_generate_key_iop_setup() and related functions.